Let's draw a drawing for the task
Where
"OB=3.10km"
Then
a person will cover the distance to the north
"OA=OB \\cdot \\sin(25^0)=3.1 \\cdot 0.423=1.31 km"
a man will walk the distance to the east
"AB=OB \\cdot \\cos(25^0)=3.1 \\cdot 0.906=2.81 km"
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